SEO Strategy

Choosing Between Singular and Plural Keywords for SEO

When SEO professionals aim to optimize content, they face a decision: Should they prioritize the singular or plural version as the main keyword? Is it possible to rank for both versions on the same page, or is a separate page necessary?

Having been in the SEO industry for more than ten years, I’ve encountered this decision numerous times and developed a sense of which option is more effective.

While one can evaluate each keyword on a case-by-case basis, there are times when this decision needs to be made in bulk, especially when handling content for large ecommerce sites. It’s essential to determine which keyword version to use on product detail pages (PDPs) and category pages.

Understanding Plural Keywords and Search Intent

Throughout my career, I’ve observed a common trend: Singular keywords are typically informational, whereas plural keywords often play a role in a buyer’s commercial research.

This is especially true in sectors like SaaS, B2B, and traditional content marketing. As a Senior SEO Manager, I’ve noticed that someone searching "headless CMS" might be looking for an explanation, while "headless CMSes" suggests an interest in buying options.

When shopping online and choosing a product, people are more likely to search for "men’s shirts" rather than "men’s shirt." But if they search for "brand slim white shirt," their intent is likely transactional, indicating readiness to purchase.

Google doesn’t always recognize these nuances. If it believes users are exploring multiple options or aren’t sure what they’re looking for, it might display a variety of product category pages.

Detailed search queries, such as specifying a brand and model or searching for niche or trending products, are more likely to return a specific product detail page.

Analyzing Keyword Intent

Data shows that singular keywords generally dominate search results for most intents, except commercial ones. Singular keywords are:

  • 65% more likely to have informational intent.
  • 46% more likely to have transactional intent.
  • 27% more likely to have navigational intent.

Plural keywords surpass singular ones primarily in commercial intent, with just a 5% difference. This suggests that singular keywords can often possess more ambiguous intent, being 23% more likely to have multiple intents than plural keywords.

As users delve into research and understanding their needs, their search queries become more refined. However, in the initial phase, search intent can appear quite unclear.

Analyzing SERP Similarity

Half of the time, singular and plural keyword SERPs share seven to nine URLs. Occasionally, the SERP results are entirely identical due to overlapping intents between singular and plural keywords.

SEO experts often debate whether to use singular or plural keywords for URLs, but typically, one can rank for both on the same page. However, in certain cases, there may be no URLs in common, often because singular and plural versions hold distinct meanings.

Examples include "basketball" (the sport) and "basketballs" (the item used in the sport), or "switches" (light controls) and "Switches" (Nintendo console). Such differences highlight how certain words change meaning based on their singular or plural form, known as heteronyms.

Based on data, best practice suggests recognizing the overlapping intent of singular and plural keywords, allowing brands to position themselves similarly in rankings regardless of the keyword’s grammatical number.

Analyzing SERP Features

Investigations into how frequently SERP features appear in searches reveal consistent trends with singular keywords offering a broader range of search intents, and plural keywords aligning more with commercial intent.

Knowledge Panels and People Also Ask features appear more with singular terms, aligning with informational queries, whereas Related Searches are more common with plural terms, suggesting an enhancement of the research journey for users.

Plural SERPs also tend to include more Popular Products, further affirming the association of plural keywords with commercial intent. Singular searches are more inclined to contain indented results, indicating potential ambiguity in intent.

Implications for Ecommerce SEO Strategy

Ultimately, plural keywords align with commercial research, while singular keywords serve informational, navigational, or transactional purposes.

  • The intended goal of your page should inform the choice of keyword version.
  • Category pages benefit from plural keywords as they guide users toward products.
  • Product pages should employ singular keywords.
  • While grammatical changes can’t be fully automated in SEO strategy, one can generally expect to rank for both singular and plural versions on the same page.
  • Intent is multifaceted and subject to change. A trend toward further differentiation between plural and singular keywords in SERPs suggests this aspect will require ongoing attention as Google evolves its search and AI capabilities.

Understanding intent will become increasingly crucial for ecommerce, taking a central role in SEO strategies.

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