snowball tree
accrue
accumulate
accumulation
acervation
advance
agglomerate
agglomeration
aggregate
aggregation
amassment
appreciate
augment
avalanche
ball
balloon
bead
blizzard
bloat
boom
breed
broaden
build
bulk
chunk
congeries
conglobation
conglobulate
conglomerate
conglomeration
crescendo
crystal
cumulation
develop
dilate
distend
driven snow
enlarge
expand
extend
fill out
flake
flurry
gain
gain strength
gathering
get ahead
globe
glomeration
go up
gob
bombard
frozen dessert
increase
pelt
sand verbena
snowballed
snowballing
snowballs
peony
syringa