17-letter words containing p, h, o, t, a, s
- thousandths-place — last in order of a series of a thousand.
- triskaidekaphobia — fear or a phobia concerning the number 13.
- turbosupercharger — (formerly) a turbocharger.
- ultrametamorphism — metamorphism during which the temperature of a rock exceeds its melting point.
- warehouse receipt — a receipt for goods placed in a warehouse.