conception has 7 distinct synonyms spread across 3 of its 4 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 one recorded opposite is misconception.
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.
an abstract or general idea inferred or derived from specific instances
the act of becoming pregnant; fertilization of an ovum by a spermatozoon
the event that occurred at the beginning of something
“from its creation the plan was doomed to failure”
the creation of something in the mind
Synonyms, antonyms and the broader and narrower relations for conception come from Princeton University’s WordNet. Full sources and licences.