keyword

a versus an rule

Monthly search volume and cost-per-click data for "a versus an rule" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=a+versus+an+rule&country=us" +--------------+------------------+ | volume | 1,600 | | cpc | $0.08 | | competition | 0.01 | | country | US | | updated | 2026-06-08 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
a versus an	6,600	$0	20/20
an vs a	6,600	$0	20/20
a vs an	6,600	$0	19/20
when to use a or an	5,400	$0.02	20/20
an when to use	5,400	$0.02	18/20
a or an	2,900	$0	20/20
an or a	1,600	$0	20/20
a and an rules	1,300	$0	20/20
a or an rule	1,300	$0	20/20
an vs a rule	1,300	$0.05	20/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=a+versus+an+rule&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt