feastest

As verbs the difference between fastest and feastest

is that fastest is archaic second-person singular of fast while feastest is archaic second-person singular of feast.

As an adjective fastest

is superlative of fast.

As an adverb fastest

is superlative of fast pos=adverb.

As an adjective featest

is superlative of feat.

As a verb feastest is

archaic second-person singular of feast.

As an adjective leastest

is least.

As a verb feastest is

archaic second-person singular of feast.