while A2

/ʍaɪl/ During the time that; at the same time as.

whilst C1

/ʍaɪlst/ During the time that; while (chiefly British and formal).

whilom C2+

/ˈhwaɪləm/ archaic word for formerly or former

erewhile C2+

/ˈɛrˌwaɪl/ a short time ago; formerly

whiles C2+

/waɪlz/ while; during the time that (archaic or dialectal)