laugh vs facial expression

laugh and facial expression both are nouns.

Word	Noun	Adjective	Verb	Adverb
laugh	Yes	No	Yes	No
facial expression	Yes	No	No	No

As nouns, facial expression is a hypernym of laugh; that is, facial expression is a word with a broader meaning than laugh:

Other hypernyms of laugh include facial gesture.

laugh (noun)	facial expression (noun)
the sound of laughing	the feelings expressed on a person's face
a humorous anecdote or remark intended to provoke laughter	a gesture executed with the facial muscles
a facial expression characteristic of a person laughing

laugh (verb)	facial expression (verb)
produce laughter