15-Letter Words Containing: A,T,O,S,A

• the process of making a word to express a concept

• The fused head and thorax of spiders and crustaceans

• extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds

• regarding something abstract as a material thing

• providing a chart or outline of a system

• the act of reducing to a scheme or formula