Keyword proximity in SEO refers to how close key tems of a keyword or a phrase are to one another. e.g. keyword : java developer jobs
close proximity: You can search java developer jobs online on job portals.
far proximity: Are you java developer, and looking for jobs? Search online at job portals.
Keyword prominence In SEO refers to the prominent placement of keywords or phrases within a page content and other elements of web page. The placement of keywords may be in the page header, meta tags, opening paragraph, heading tags or start of a sentence which makes the keyword prominency.