six months. semester. Associated words: [half-yearly], semi-annual, bi-annual, semestral.
six-sided, a. cubic, hexahedral, hexagonal.
six-sided body. [cube], hexahedron.
six-sided figure. hexagon.
sixty, n. Associated words: sexagenary, sexagesimal.
sixty years. Associated words: sexagenarian, sexagenary.
six years. Associated words: sexennial, sexennially.
size, n. magnitude, [volume], dimensions, amplitude, [bulk], [extent], [bigness].
skedaddle, v. (Slang) run [away], flee, decamp, [scuttle], [scamper], [scurry].
skeptic, n. [unbeliever], [infidel].