help has 11 distinct synonyms spread across 10 of its 12 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.
improve the condition of
“These pills will help the patient”
abstain from doing; always used with a negative
“I can't help myself--I have to smoke”
contribute to the furtherance of
“This money will help the development of literacy in developing countries”
improve; change for the better
“New slipcovers will help the old living room furniture”
the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
“he gave me an assist with the housework”
Synonyms, antonyms and the broader and narrower relations for help come from Princeton University’s WordNet. Full sources and licences.
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
“my invaluable assistant”
a person or thing that is a resource that helps make something easier or possible to do
“visual aids in teaching”