chew vs mastication

chew and mastication both are nouns.

Word	Noun	Adjective	Verb	Adverb
chew	Yes	No	Yes	No
mastication	Yes	No	No	No

As nouns, chew and mastication are synonyms defined as:

chew and mastication: biting and grinding food in your mouth so it becomes soft enough to swallow

Other synonyms of chew include chewing, manduction.

chew (noun)	mastication (noun)
biting and grinding food in your mouth so it becomes soft enough to swallow	biting and grinding food in your mouth so it becomes soft enough to swallow
a wad of something chewable as tobacco

chew (verb)	mastication (verb)
chew (food); to bite and grind with the teeth