Synonyms of second-in-command

1 Syllable
sub, aide
2 Syllables
factor, backup, regent, proxy
3 Syllables
deputy, lieutenant, appointee, minister, councilor, legate, deputies, dogcatcher
4 Syllables
surrogate, ambassador, substitute, commissioner, replacement, representant, delegate
5 Syllables
subordinate
6 Syllables
representative