Vary, veer, warp, turn could all be synonyms of change. If they mean the money type of change, coin could be a word
take
swap
site sireside
Flux.
The word would be sane.
card care carp cars
hare
buck
A four letter word starting with the letter a is able.
The four-letter word you are looking for is "melt." It describes the process of a solid turning into a liquid as it is heated, such as ice melting into water.
It depends on what you mean by 'four letter word'. Thea has four letters, so yes it is. It is not a swear word, so it's not that kind of 'four letter word'.
A four letter word for 'in addition to' is also.