Nouns

(n)hoard, cache, stasha secret store of valuables or money

Verbs

(v)hoard, stash, cache, lay away, hive up, squirrel awaysave up as for future use
(v)roll up, collect, accumulate, pile up, amass, compile, hoardget 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”