accessory
accompanying
ancillary
associated
attendant
coincident
collateral
combined
concomitant
concurrent
conjoint
correlative
coupled
fellow
helping
incident
joined
joint
menial
ministering
mutual
paired
parallel
satellite
servile
serving
servitorial
simultaneous
twin
waiting
amending
apprehending
ascending
befriending
bending
blending
commending
comprehending
condescending
contending
defending
depending
descending
ending
expending
extending
fending
impending
intending
lending
mending
misspending
offending
overextending
pending
portending
pretending
recommending
rending
sending
spending
suspending
tending
transcending
trending
unbending
unending
vending
wending