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Only four words hold S second and O third, and three of them are really one word.
The psoas is a deep muscle running from the lower spine to the thigh, and anyone who has done physiotherapy or yoga has heard of it. PSOAE and PSOAI are both accepted plurals, so three entries here name the same thing.
It is an old medical term for an itchy skin condition, and it survives in psoriasis. So the whole page comes down to one muscle and one skin complaint.
P takes four of the four, which is all of them, and in every case the P is not pronounced. That is a Greek inheritance English kept in the spelling and dropped in the speech.
As SO az, with the P silent. Physiotherapists say it constantly and most people mispronounce it the first time they read it.
PSOAS is both the singular and a common plural. PSOAE and PSOAI are Latin and Greek plurals that survive in anatomical writing.
An old name for scabies or a similar itching skin disease. It is the root behind psoriasis.
PSOAS, comfortably. It is the only form a general reader is likely to have met, and the other two are variants of it.
Yes, and they cluster in Greek borrowings. Psalm, pseudo and psyche all keep a P that nobody says.