Synonyms for Bur:

n.

artifact (noun)
burr.
bur (noun)
burr.
plant (noun)
burr.
prickly (noun)
boll, grain, bramble, pod, dcase, nut, d pod, acorn.

v.

change (verb)
burr.

Other synonyms:

Burr
burr.
boll, pod. nut. blackberry
bramble.
Other relevant words:
bramble, nut, boll, pod.