expand vs puff up

expand and puff up both are verbs.

Word	Noun	Adjective	Verb	Adverb
expand	No	No	Yes	No
puff up	No	No	Yes	No

As verbs, puff up is a hyponym of expand; that is, puff up is a word with a more specific, narrower meaning than expand:

expand (verb)	puff up (verb)
grow vigorously	make larger or distend
exaggerate or make bigger	to swell or cause to enlarge
become larger in size or volume or quantity	praise extravagantly
expand the influence of	become filled with pride, arrogance, or anger
make bigger or wider in size, volume, or quantity
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
extend in one or more directions