As verbs the difference between nested and bested
is that nested is (nest) while bested is (best) or bested can be variant of (bestead).
nested
English
Verb
(head)
(nest)
embedded
successively fit inside another.
Anagrams
*
bested
English
Etymology 1
(best) + (-ed)
Verb
(head)
(best)
Etymology 2