Here is a list of nouns that start with BU.

bubble, buck, buckboard, bucket, buckle

buckshot, buckskin, buckwheat, bud, buddy

budget, budgeting, buff, buffalo, buffer

buffet, buffoon, bug, buggy, bugle

bugler, build, builder, building, buildup

bulb, bulge, bulk, bulkhead, bull

bullet, bulletin, bullhide, bullshit, bully

bulwark, bum, bumblebee, bumming, bump

bumper, bun, bunch, buncha, bundle

bungalow, bunk, bunker, bunkmate, bunt

bunter, buoyancy, burden, bureau, bureaucracy

bureaucrat, bureaucratization, burglar, burglary, burial

burl, burlesque, burley, burn, burning

burr, burrow, burst, busboy, bush

bushel, businessman, businessmen, bust, bustle

butane, butcher, butchery, butler, butt

butter, butterfat, butterfly, butternut, button

butyrate, buy, buyer, buying, buzz

Hope you enjoy this page of nouns that start with bu and the rest of this noun list a-z site as well.