crispen vs toast

crispen is not a noun while toast is a noun.

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

As verbs, crispen and toast are synonyms defined as:

Other synonyms of crispen include crisp.

crispen (noun)	toast (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

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