It is a verb.
Meaning : change completely in form or nature i.e. to change into a wholly different appearance.
Synonyms : transform, change, mutate, transmute, transfigure, convert, alter, vary, modify, remodel, recast
1)Over the years she has metamorphosed from a gawky looking teenager into a beautiful young woman.
2)One has to metamorphose himself according to the environment.
3)Its been a long time since I had seen him and I am unable to recognize him now as he has totally metamorphosed.
4)The singer metamorphosed his voice from one tone to the other at the change of song.