bulb (n.)
- ball
- balloon
- bilge
- bladder
- blain
- bleb
- blister
- blob
- boll
- bolus
- boss
- bow
- bubble
- bulbil
- bulblet
- bulge
- bulla
- bump
- bunch
- burl
- button
- chine
- clump
- condyle
- corm
- dowel
- ear
- ellipsoid
- flange
- flap
- gall
- globe
- globule
- glomerulus
- gnarl
- gob
- gobbet
- handle
- hill
- hump
- hunch
- jog
- joggle
- knob
- knot
- lip
- loop
- lump
- mole
- mountain
- nevus
- nub
- nubbin
- nubble
- orb
- orbit
- papilloma
- peg
- pellet
- radicle
- radix
- rhizome
- rib
- ridge
- ring
- root
- rootstock
- shoulder
- sphere
- spheroid
- spherule
- spine
- stud
- style
- tab
- tap
- taproot
- tuber
- tubercle
- verruca
- vesicle
- wale
- wart
- welt
