toast vs crispen

toast is a noun but crispen is not a noun.

Word	Noun	Adjective	Verb	Adverb
toast	Yes	No	Yes	No
crispen	No	No	Yes	No

As verbs, toast and crispen are synonyms defined as:

Other synonyms of toast include crisp.

toast (noun)	crispen (noun)
slices of bread that have been toasted
a drink in honor of or to the health of a person or event
a celebrity who receives much acclaim and attention
a person in desperate straits; someone doomed

toast (verb)	crispen (verb)
make brown and crisp by heating	make brown and crisp by heating
propose a toast to