S: (n) linesman (official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside))
S: (n) referee, ref ((sports) the chief official (as in boxing or American football) who is expected to ensure fair play)
W: (n) office [Related to: official] ((of a government or government official) holding an office means being in power) "being in office already gives a candidate a great advantage"; "during his first year in office"; "during his first year in power"; "the power of the president"
S: (adj) official (of or relating to an office) "official privileges"
S: (adj) official (verified officially) "the election returns are now official"