bottle up vs smother

bottle up is not a noun while smother is a noun.

Word	Noun	Adjective	Verb	Adverb
bottle up	No	No	Yes	No
smother	Yes	No	Yes	No

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

bottle up: consciously restrain from showing; of emotions, desires, impulses, or behavior
smother: suppress in order to conceal or hide

Other hyponyms of bottle up include dampen, stifle, muffle, repress, stifle, strangle, choke.

bottle up (noun)	smother (noun)
	a stifling cloud of smoke
	a confused multitude of things

bottle up (verb)	smother (verb)
consciously restrain from showing; of emotions, desires, impulses, or behavior	deprive of oxygen and prevent from breathing
	suppress in order to conceal or hide
	envelop completely
	deprive of the oxygen necessary for combustion
	form an impenetrable cover over