For and four form one of the sets of homophones listed by the then Poet Laureate Robert Bridges.
(For more, see Bridges homophones). AWE has a category listing our articles on each of these.
- for is a preposition.
- four is the spelling of the number 4.
- You may also want to see AWE's article on the prefixes For- and fore-,
Confusion arises in compounds of the number: see also fourteen - forty. There is also a confusable homophone in forth and fourth.