contact has 15 distinct synonyms spread across 9 of its 11 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
close interaction
“they kept in daily contact”
the state or condition of touching or of being in immediate proximity
“litmus paper turns red on contact with an acid”
a person who is in a position to give you special assistance
“he used his business contacts to get an introduction to the governor”
a channel for communication between groups
“he provided a liaison with the guerrillas”
(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
“they forget to solder the contacts”
a communicative interaction
“the pilot made contact with the base”
a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
be in or establish communication with
“Our advertisements reach millions”
Synonyms, antonyms and the broader and narrower relations for contact come from Princeton University’s WordNet. Full sources and licences.