2018 Grand Tour Questions

[Frump]

Compound words are two or more words which when combined have a completely different meaning. For example words like ice cream, fireman, or up-to-date are compound words.

So, if simple compound words don't count, do compound words like "post office", "breakfast", "northwest" and "southeast" count? I'm pretty confused now.

Maybe you simply meant the hyphen makes "best-preserved" a single word which ends with "ed" and I should just avoid confusing English rules regarding compound words?