WordNet sense 1 (fruit preserved by cooking with sugar):

conserve, preserves, conserves, conserve

WordNet sense 2 (maintain in safety from injury, harm, or danger):

keep

WordNet sense 3 (keep or maintain in unaltered condition; cause to remain or last):

continue, uphold, carry on, bear on

WordNet sense 4 (keep in safety and protect from harm, decay, loss, or destruction):

maintain, keep up

WordNet sense 5 (to keep up and reserve for personal or special use):

save