big, huge, large, massive
small
cluster, fire (usually firebomb), high-explosive, incendiary, mortar, nail, petrol (BrE), smoke
atom, atomic, hydrogen, neutron, nuclear
bouncing (BrE), flying
terrorist
home-made
unexploded
stray (esp. BrE)
Their truck was hit by a stray bomb.

dummy (esp. BrE), fake
The suspect was apprehended for planting a fake bomb in a bus terminal.
a practice flight with dummy bombs

car, roadside
letter, parcel (BrE)
dirty
smart (= one that is controlled by an electronic device)
suicide
time (figurative)
He described global warming as ‘an environmental time bomb’.

place, plant, put
Police suspect terrorists planted the bomb.

carry
The plane had been adapted to carry bombs.

drop, release
Enemy planes dropped bombs on the airport.

defuse, disarm
detonate, explode, set off
build, construct, develop, test (These verbs are only used about countries.)
India started to build a nuclear bomb.

make
He used a clock to make a home-made bomb.

strap, strap on
The bombs were strapped to their chests.

fall, rain, rain down
Eighty people died when bombs rained down on the city's crowded streets.

hit sth
detonate, explode, go off
blow sb/sth to pieces, blow sth up, destroy sth, kill sb, rip through sth
Fifteen people were blown to pieces by the car bomb.
A terrorist bomb ripped through the station.

target sb/sth
be ticking away

attack, blast, explosion
alert (esp. BrE), scare, threat, warning (BrE)
plot
hoax (BrE)
disposal, squad
shelter
crater
The land was scarred with bomb craters.

damage
site
factory
victim
suspect
test
the fallout from atomic bomb tests

heavily
The city had been very heavily bombed.

accidentally, mistakenly

Bomb is used with these nouns as the subject:
aircraft

Bomb is used with these nouns as the object:
barracks, embassy