Synonyms for second

secondary, subordinate, inferior, next, next in order, following, next to the first, next in rank, another, other; see also unimportant.

on further consideration, on mature consideration, in reality, on the other hand, as an afterthought; see also incidentally.

defer to, be inferior to, be less successful than, get less attention than; see fail 1.

flash, trice, flash of an eyelid; see moment, instant.