Answer: burlers

AnswerCrossword Clue
burlersBURLER, one who burls (to finish cloth by removing knots)
burlersdome-shaped growth on the trunk of a tree; wartlike structure sometimes 2 ft. (0.6 m) across and 1 ft. (0.3 m) or more in height, sliced to make veneer
burlerssmall knot or lump in wool, thread, or cloth
burlersto remove burls from (cloth) in finishing