There are many, many 7-letter words ending in s, some of which are: Amasses, applets, hampers, infames, lurgies, mirages, animals, amities, alludes, cajoles, corsets, cowries, cowards, denotes, detains, dorsals, doubles, dollops, drawers and dragons.
spumoni, gnocchi
pickled
anthrax
science
Forward.
twinkle
shampoo
curtail
ActionsActivesActressAnimalsBeachesBeaconsBeaglesBeakersBeaniesBearersBeatersBeavers
Disobey.
chowder
stomata