utter vs pour out

utter is an adjective but pour out is not an adjective.

Word	Noun	Adjective	Verb	Adverb
utter	No	Yes	Yes	No
pour out	No	No	Yes	No

As verbs, pour out is a hyponym of utter; that is, pour out is a word with a more specific, narrower meaning than utter:

utter (adjective)	pour out (adjective)
complete and absolute
without qualification; used informally as (often pejorative) intensifiers

utter (verb)	pour out (verb)
express in speech	express without restraint
articulate; either verbally or with a cry, shout, or noise	pour out gradually, so as to separate out sediment
express audibly; utter sounds (not necessarily words)	be disgorged
put into circulation	pour out liberally