alignment has 4 distinct synonyms spread across 2 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 nonalignment.
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 organization of people (or countries) involved in a pact or treaty
Synonyms, antonyms and the broader and narrower relations for alignment come from Princeton University’s WordNet. Full sources and licences.
(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
the act of adjusting or aligning the parts of a device in relation to each other