Distinguish between majority and plurality. Majority means the lead of a candidate over all other candidates. Plurality means the lead of a candidate over one other candidate.
Event, incident, affair, occurrence, happening, circumstance do not mean the same things. Look them up.
Use preventive, not preventative.
Distinguish between ambassador, minister, consul, envoy.
Avoid feminine forms of such words as author, artist, dancer, violinist, pianist, poet. It may be necessary occasionally to change more than the spelling. For example, the world's greatest pianiste may not mean the world's greatest pianist.
Prefer motorist to automobilist and autoist.
Sewer is a drain. Sewage is what goes through it. Sewerage is a system of drains.
Don't use divine as a noun.
Don't write couple unless you mean two things joined and not merely two.
Don't write party for person, nor people for persons.