concern

[1]	refer/relate to , have relation/reference to , be about , pertain/appertain to , be pertinent/relevant to , regard , apply to , be connected/involved with , bear on , be germane to , be connected with , involve , apply to , touch (on)
[2]	affect , have (a) bearing/(an) influence on , involve , touch , interest , be of importance/interest to
[3]	worry , trouble , disturb , bother , perturb , unsettle , upset , distress
[4]	refer , pertain , relate , come to , touch on , have-to doe with
[5]	occupy

[1]	fear
[2]	business , affair , headache , vexation , problem , responsibility , duty , charge , task , involvement , (Colloq) thing , (Slang) bag , shtick
[3]	interest , regard , business concern , business organization , consideration , care , business organisation , thought , awareness , attention
[4]	anxiety , worry , solicitude , apprehension , distress , apprehensiveness , uneasiness , malaise , disquiet , disquietude
[5]	business , firm , company , house , establishment , enterprise , organization
[6]	matter , affair , issue