declare oneself vs pop the question

declare oneself and pop the question both are verbs.

Word	Noun	Adjective	Verb	Adverb
declare oneself	No	No	Yes	No
pop the question	No	No	Yes	No

As verbs, declare oneself and pop the question are synonyms defined as:

Other synonyms of declare oneself include offer, propose.

declare oneself (verb)	pop the question (verb)
ask (someone) to marry you	ask (someone) to marry you