photophobia vs photalgia

photophobia and photalgia both are nouns.

Word	Noun	Adjective	Verb	Adverb
photophobia	Yes	No	No	No
photalgia	Yes	No	No	No

As nouns, photophobia and photalgia are synonyms defined as:

photophobia and photalgia: pain in the eye resulting from exposure to bright light (often associated with albinism)

photophobia (noun)	photalgia (noun)
pain in the eye resulting from exposure to bright light (often associated with albinism)	pain in the eye resulting from exposure to bright light (often associated with albinism)
a morbid fear of light