18-letter words containing t, o, y, i, s
- white iron pyrites — marcasite
- white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America
- wireless telephony — Now Rare. radiotelephony.
- with flying colors — with flying colors, with an overwhelming victory, triumph, or success: He passed the test with flying colors.
- withdrawal symptom — effects of stopping a drug
- working hypothesis — See under hypothesis (def 1).
- young conservative — a member of the youth section of the United Kingdom Conservative Party