accustom → achieve
accustom (make used to, get used to): I cannot accustom myself to a hot climate.
ace (someone who is very good at something): He is a computer ace.
ace (do very well, earn a very high grade): I aced my entrance exams.
acerbic (direct, clever and cruel): Our boss does not hesitate to make acerbic comments to employees who are not doing their jobs.
(a dull continuous pain): I had an ache in my lower back last night.
ache (suffer from dull continuous pain): My arms ache from shoveling snow.
ache (want something very much): I have been aching to see you soon.
achieve (reach a goal): She eventually achieved her goal of becoming a teacher.