| A | B |
| triathlon | a long-distance race that has three parts: swimming, bicycling, and running |
| trilogy | a series of three novels, movies, etc., that are closely related and involve the same characters or themes |
| trimester | a period of three months; one of three periods into which a school year is sometimes divided. |
| trident | a fishing spear that has three point and that looks like a large fork |
| quadrangle | a flat shape that has four sides and four angles |
| quartet | a group of four singers or musicians who perform together |
| quart | a US customary unit of measurement for liquids; 4 quarts equals a gallon. |
| pentagon | a flat shape that has five sides and five corners. |
| pentagram | a shape that is like a star with five points formed by five straight lines. |
| quintuplet | one of five babies that are born at the same time to the same mother. |