Don't is a contraction of do not. Doesn't is the contraction for does not. I don't, they don't, he doesn't.
Due should not be used for owing to or because of.
Each is distributive and is always singular. Each other which is applicable to two only should not be confused with one another which is applicable to more than two.
Egotist, a man with a high or conceited opinion of himself, should not be confused with egoist which is the name for a believer in a certain philosophical doctrine.
Either is distributive and therefore singular and should never be used of more than two.
Elegant denotes delicacy and refinement and should not be used as a term of general approval.
Else should be followed by than, not by but. "No one else than (not but) he could have done so much."
Emigrant, one who goes out of a country should not be confused with immigrant, one who comes into a country.
Enormity is used of wickedness, cruelty, or horror, not of great size, for which enormousness should be used. We speak of the enormity of an offence but of the enormousness of a crowd.
Enthuse should not be used as a verb.