Word: grinnest
Part of speech: Verb
Syllables: gri
nnest
Definition: Alternative form of grin; to draw back the lips and reveal the teeth, in a smile, grimace, or snarl
Morphemes:
Affix: grin
Language: en
PoS: Verb
Meaning: To smile, parting the lips so as to show the teeth.
Affix: -est
Language: en
PoS: Suffix
Meaning: Used to form the second-person singular present tense and past tense of verbs. (if thou is the subject; not used with you)