"ph":
* Phone: from the Greek word "phōnē" meaning "sound" or "voice."
* Phantom: from the Greek "phantasma," meaning "apparition."
* Pharmacy: from the Greek "pharmakeia," meaning "drug" or "poison."
* Philanthropy: from the Greek "philanthropos," meaning "lover of mankind."
* Photo: from the Greek "phos," meaning "light."
* Physique: from the Greek "physike," meaning "nature" or "body."
* Philosophy: from the Greek "philosophia," meaning "love of wisdom."
* Phobia: from the Greek "phobos," meaning "fear."
* Phrase: from the Greek "phrasis," meaning "speech" or "expression."
* Physics: from the Greek "physikē," meaning "nature" or "natural things."
"phen":
* Phenomenon: from the Greek "phainomenon," meaning "that which appears."
* Phenotype: from the Greek "phainein," meaning "to show" and "typos," meaning "type."
* Phenomenal: from "phenomenon."
* Phenomenology: the study of phenomena.
Other roots:
* Ephemeral: from the Greek "ephemeros," meaning "lasting for a day."
Let me know if you have any other words in mind, and I'll be happy to help!