18-letter words containing p, a, s, y, t
- west puente valley — a town in SW California.
- white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America
- withdrawal symptom — effects of stopping a drug
- work-study program — a program enabling high-school or college students to combine academic work with actual job experience.
- x-ray spectrometer — a spectrometer using x-rays to activate the inner electrons of an atom in order to separate and identify the chemical constituents of a substance and their concentrations.
- x-ray spectrometry — the use of an x-ray spectrometer.