"Comprise," "discrete," and "infer," when they mean "compose," "discreet," and "imply."

"Comprise" cannot substitute for "compose"; it is never followed by "of."

All GooseDown USA insulation products are comprised of are composed of materials purchased from American sources.

Note: Some grammarians equate "comprise" with "include," but be careful: A fielded soccer team might "include" four midfielders, but it "comprises" eleven players. In the example above, if GooseDown USA uses materials solely from American sources, here is the better way to rewrite the sentence:

All GooseDown USA insulation products are comprised of comprise materials purchased from American sources.

"Discrete" means separate, distinct, like layers in igneous rock or a rainbow cake. "Discreet" describes someone prudent, perhaps circumspect.

Had the defendant been more discrete discreet by siphoning less cash each week, the accounting systems would never have detected her scheme.

Only a writer or speaker can "imply"; only a reader or listener can "infer."

I imply infer from his response he has no intention of settling.

Fair or not, when we misuse words like these, clients, colleagues, and judges wonder if they can trust the rest of our thought processes. The opposite is also true: When we use them correctly, others pay attention.