shadow

[1]	follow , trail , track , dog , stalk , pursue , trace , (Colloq) tail , (US/Canadian) bird-dog
[2]	shade , shade off
[3]	overshadow , dwarf

[1]	darkness , gloom , dimness , dusk , obscurity
[2]	cover , darkness , dark , screen , covering , shield , veil , curtain , protection , concealment
[3]	hint , apparition , phantom , intimation , suggestion , phantasm , phantasma , suspicion , trace , fantasm , vestige , remnant
[4]	cloud , blight , curse
[5]	companion , trace , vestige , alter ego , comrade , tincture , (Colloq) sidekick , crony , chum , (bosom) pal , (US) (bosom) buddy
[6]	tail , shadower