As nouns the difference between weasel and teasel
is that
weasel is the least weasel,
Mustela nivalis while
teasel is any of several plants of the genus
Dipsacus.
As verbs the difference between weasel and teasel
is that
weasel is to achieve by clever or devious means while
teasel is to raise the nap on cloth; to tease; to card.