humpbacked

humpbacks

kickback

kickbacks

lactobacilli

lactobacillus

leaseback

leasebacks

leatherback

leatherbacks

linebacker

linebackers

linebacking

mossback

mossbacked

mossbacks

mycobacteria

mycobacterial

mycobacterium

nonbacterial

nontobacco

notchback

notchbacks

outback

outbacks

paperback

paperbacked

paperbacks

payback

paybacks

pickaback

pickabacked

pickabacking

pickabacks

piggyback

piggybacked

piggybacking

piggybacks

playback

playbacks

plowback

plowbacks

puffback

puffbacks

pullback

pullbacks

pushback

pushbacks

quarterback

quarterbacked