Term: airmail letter: a letter sent by air mail
Broader: letter: a written message addressed to a person or organization | Unrelated: beaker: a flatbottomed jar made of glass or plastic; used for chemistry
Broader: letter: a written message addressed to a person or organization | Unrelated: sine curve: the curve of y=sin x
Broader: letter: a written message addressed to a person or organization | Unrelated: pool: something resembling a pool of liquid
Broader: letter: a written message addressed to a person or organization | Unrelated: cryptomeria: Japanese cedar; sugi
Broader: letter: a written message addressed to a person or organization | Unrelated: ewe: a member of a people living in southern Benin and Togo and southeastern Ghana
Broader: letter: a written message addressed to a person or organization | Unrelated: bodkin: a blunt needle for threading ribbon through loops
Broader: letter: a written message addressed to a person or organization | Unrelated: drag: the phenomenon of resistance to motion through a fluid
Broader: letter: a written message addressed to a person or organization | Unrelated: tormentor: someone who torments
Broader: letter: a written message addressed to a person or organization | Unrelated: enlightenment: education that results in understanding and the spread of knowledge
Broader: letter: a written message addressed to a person or organization | Unrelated: perennation: the process of living through a number of years (as a perennial plant)