Word Unit: buco-, buc- (Greek: rural, rustic, pastoral)
Word Unit: bufo- (Latin: toad)
Word Unit: bul-, boul- (Greek: will)
Word Unit: bulbo- (Greek > Latin: onion, bulbous root, bulb; ball-shaped part of the stem of certain plants; such as, onions, tulips etc, from which their roots grow)
Word Unit: bull-, bulli- (Latin: to bubble, a bubble; to blister, a blister)
Cross references of word groups that are related, partially or extensively, to: "blister, bump, swelling": ichor-; papulo-; pemphig-; puro-; pus-; pustu-; pyo-; suppurant-; tum-; vesico-; vesiculo-.

Word Unit: bursa-, burso-, burs- (Greek > Latin: bag, sac, saclike; purse)
Word Unit: -bust, -ust, -bur; bust-, bur-, ur- + (Latin: burere, "to burn up"; from urere, with an inserted or faulty separation of b in amburere, "to burn around"; which stands for amb-urere, "to burn around", but it was misdivided into am-burere and because of this misdivision, the new verb burere was formed with the past participle bustum; so, it really came from urere, "to burn, to singe")

Cross references of word groups that are related, directly, indirectly, or partly to: "fire, burn, glow, or ashes": ars-, ard-; cand-, cend-; caust-, caut-; crema-; ciner-; ether-; flagr-; flam-; focus, foci-; fulg-; gehenna-; ign-; phleg-; phlog-; pyreto-, -pyrexia; pyr-; spod- (ashes; waste); volcan-.

Word Unit: butyro-, butyr- + (Greek > Latin: butter; from bou[s] , "ox, cow" plus tyro[s], "cheese")
Word Unit: bysso-, byss- + (Greek: flax)