grin vs simper

grin and simper both are nouns.

Word	Noun	Adjective	Verb	Adverb
grin	Yes	No	Yes	No
simper	Yes	No	Yes	No

As nouns, simper is a hyponym of grin; that is, simper is a word with a more specific, narrower meaning than grin:

grin: a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement
simper: a silly self-conscious smile

Other hyponyms of grin include smirk.

grin (noun)	simper (noun)
a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement	a silly self-conscious smile

grin (verb)	simper (verb)
to draw back the lips and reveal the teeth, in a smile, grimace, or snarl	smile affectedly or derisively