popularise vs circularize

popularise and circularize both are verbs.

Word	Noun	Adjective	Verb	Adverb
popularise	No	No	Yes	No
circularize	No	No	Yes	No

As verbs, circularize is a hypernym of popularise; that is, circularize is a word with a broader meaning than popularise:

popularise: cater to popular taste to make popular and present to the general public; bring into general or common use
circularize: cause to become widely known

popularise (verb)	circularize (verb)
make understandable to the general public	make circular
cater to popular taste to make popular and present to the general public; bring into general or common use	cause to become widely known
	distribute circulars to
	canvass by distributing letters
	canvass by using a questionnaire