As promised.....
From
The Mother Tongue (English & How it Got That Way):
Sometimes the same word reaches us at different times, having undergone various degrees of filtering, and thus can exist in English in two or more related forms, as with canal and channel, regard and reward, poor and pauper, catch and chase, cave and cage, amiable and amicable. Often these words have been so modified in their travels that their kinship is all but invisible. Who would guess that coy and quiet both have the same grandparent in the Latin quietus, or that sordid and swarthy come jointly from the Latin sordere (to be soiled or dirty), or that entirety and integrity come from the Latin integritus (complete and pure)?
The most extreme example he gives is the Latin word
discus that English has borrowed repeatedly and turned into: disk, disc, dish, desk, dias and discus.
