subordinate has 8 distinct synonyms spread across 5 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are dominant, insubordinate.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
subject or submissive to authority or the control of another
“a subordinate kingdom”
(of a clause) unable to stand alone syntactically as a complete sentence
“a subordinate (or dependent) clause functions as a noun or adjective or adverb within a sentence”
an assistant subject to the authority or control of another
make subordinate, dependent, or subservient
“Our wishes have to be subordinated to that of our ruler”
Synonyms, antonyms and the broader and narrower relations for subordinate come from Princeton University’s WordNet. Full sources and licences.