boast vs amplify

boast is a noun but amplify is not a noun.

Word	Noun	Adjective	Verb	Adverb
boast	Yes	No	Yes	No
amplify	No	No	Yes	No

As verbs, amplify is a hypernym of boast; that is, amplify is a word with a broader meaning than boast:

Other hypernyms of boast include exaggerate, hyperbolise, hyperbolize, magnify, overdraw, overstate.

boast (noun)	amplify (noun)
speaking of yourself in superlatives

boast (verb)	amplify (verb)
show off	increase in size, volume or significance
wear or display in an ostentatious or proud manner	increase the volume of
	exaggerate or make bigger
	to enlarge beyond bounds or the truth