order has 40 distinct synonyms spread across 16 of its 24 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 disorder.
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.
(often plural) a command given by a superior (e.g., a military or law enforcement officer) that must be obeyed
“the British ships dropped anchor and waited for orders from London”
a degree in a continuum of size or quantity
“it was on the order of a mile”
logical or comprehensible arrangement of separate elements
“we shall consider these questions in the inverse order of their presentation”
a condition of regular or proper arrangement
“he put his desk in order”
a legally binding command or decision entered on the court record (as if issued by a court or judge)
“a friend in New Mexico said that the order caused no trouble out there”
a commercial document used to request someone to supply something in return for payment and providing specifications and quantities
“IBM received an order for a hundred computers”
a formal association of people with similar interests
“he joined a golf club”
a body of rules followed by an assembly
(usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarchy
“theologians still disagree over whether `bishop' should or should not be a separate Order”
(biology) taxonomic group containing one or more families
a request for something to be made, supplied, or served
“I gave the waiter my order”
(architecture) one of original three styles of Greek architecture distinguished by the type of column and entablature used or a style developed from the original three by the Romans
the act of putting things in a sequential arrangement
“there were mistakes in the ordering of items on the list”
Synonyms, antonyms and the broader and narrower relations for order come from Princeton University’s WordNet. Full sources and licences.
bring into conformity with rules or principles or usage; impose regulations
“We cannot regulate the way people dress”
place in a certain order
“order the photos chronologically”
appoint to a clerical posts
“he was ordained in the Church”
assign a rank or rating to
“how would you rank these students?”