Consonant cluster simplification

Historical sound change when one consonant in a difficult consonant cluster is lost.

Historically, they were pronounced as written, but slowly the sound evolved to ignore the difficult consonant cluster - but the spelling did not update.

Written as Pronounced as
kn n
wr r
gn n
mn n
Homophones
Word a word b
dam damn
rap wrap
ad add
nap knap
rack wrack