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.
A four letter word for 'in addition to' is also.
Lard is a four letter word for grease.