The word "fire".
out
daydaylightdaybreakdaytime
Tat is a valid Scrabble word. The letter s can be placed in front or at the end of tat to spell the valid Scrabble words stat or tats.
The word is "land." I realize that's not three letters.
The word mar is added, creating the words marbled, marrow, margin, and martin (bird).(see the related link)
day
A five letter word that will make compound words from that list is FRONT.
out
day
daydaylightdaybreakdaytime
Tat is a valid Scrabble word. The letter s can be placed in front or at the end of tat to spell the valid Scrabble words stat or tats.
The only English words that use the letter 'ealt' at the front or back are DEALT and MISDEALT. However, if you put a letter in front and behind 'ealt' you can spell the words fealty, health, lealty, realty, or wealth.
We can't be sure the answer is accurate without knowing the following words. Consign is one possibility.
In contraction of words, the apostrophe is always placed at the spot where the letter(s) has been removed. In this case, at the place of the second o. do not: don't
No English words meet that criteria. Here are the two 9-letter words that end with front: forefront, lakefront.
Prefices (singular = prefix)
The word is "land." I realize that's not three letters.