hoard

nouns

a secret store of valuables or money
cache, hoard, stash

verbs

save up as for future use
cache, hive up, hoard, lay away, squirrel away, stash
is derived from
hoarder
get or gather together
"I am accumulating evidence for the man's unfaithfulness to his wife"; "She is amassing a lot of data for her thesis"; "She rolled up a small fortune"
accumulate, amass, collect, compile, hoard, pile up, roll up