PH- words create an F sound and mostly come from Greek. PHONE, PHOTO, PHRASE, PHASE, PHYSICAL, PHILOSOPHY, PHANTOM, and PHENOMENON are classic PH- words. In Scrabble, knowing PH- words helps because the P and H tiles can be played together for outsized board impact.
PHIZ (17 pts) is an excellent 4-letter PH word (meaning a face or physiognomy). PHON (9 pts) and PHAT (9 pts) are also solid. PH words appear frequently in crossword clues as "sounds like F" traps.
High-value word starts for Scrabble, Wordle, and crosswords