teasle vs teasel

teasle and teasel both are nouns.

Word	Noun	Adjective	Verb	Adverb
teasle	Yes	No	No	No
teasel	Yes	No	No	No

As nouns, teasle and teasel are synonyms defined as:

teasle and teasel: any of several herbs of the genus Dipsacus native to the Old World having flower heads surrounded by spiny bracts

Other synonyms of teasle include teazel.

teasle (noun)	teasel (noun)
any of several herbs of the genus Dipsacus native to the Old World having flower heads surrounded by spiny bracts	any of several herbs of the genus Dipsacus native to the Old World having flower heads surrounded by spiny bracts