The best words are the ones that add to the meaning, tone, and sound of your writing. Here are some things you should look for when creating your posts.

+Redundancy; Avoid any words or phrases that are used together but mean the same thing, or close to the same thing.

SPACING]repeat againSPACINGred in colorSPACINGrefer back

+Repetition; Watch for words that are unnecessarily repeated in a series of sentences.

SPACINGThe man looked as if he were going to give in. The man was dressed in a torn yukata. I soon realized the man was homeless..Or a stalker.

+Usage Errors; Check for words used incorrectly.

SPACINGyou're / yourSPACINGthere / theirSPACINGeffect / affect

For a full list of these, visit this thread.

+Vague Modifiers; Watch for the overuse of vague words.

Vague Modifiers: nice, neat, good, great, funny, big
Colorful Modifiers: sympathetic, intricate, sleek