topicalize vs emphasize

topicalize and emphasize both are verbs.

Word	Noun	Adjective	Verb	Adverb
topicalize	No	No	Yes	No
emphasize	No	No	Yes	No

As verbs, emphasize is a hypernym of topicalize; that is, emphasize is a word with a broader meaning than topicalize:

topicalize: emphasize by putting heavy stress on or by moving to the front of the sentence
emphasize: to stress, single out as important

Other hypernyms of topicalize include accent, accentuate, emphasise, punctuate, stress.

topicalize (verb)	emphasize (verb)
emphasize by putting heavy stress on or by moving to the front of the sentence	to stress, single out as important
	give extra weight to (a communication)