separation / segregation / selectivity or sensitivity in a radio or similar device for certain frequencies

to separate / to segregate

section, part, component

(grammar) a sentence / writing, composition / a design or pattern as decoration / literature, learning, scholarship / elegance, refinement (especially of writing or wording)

portion / part / duty

joist / cane / club / king post

half-

(literary) time; hour; season; time of the year

specialization

specialise / become differentiated