estimate

[1]	approximate , gauge , determine , judge , guess , assess , appraise , value , evaluate , reckon , calculate , work out , (Colloq) guestimate/guesstimate
[2]	consider , think , believe , guess , conjecture , judge
[3]	gauge , approximate , guess , judge
[4]	calculate , reckon , count on , figure , forecast

[1]	estimation , approximation , idea
[2]	estimation
[3]	appraisal , approximation , gauge , estimation , guess , conjecture , assessment , appraisal , evaluation , reckoning , calculation , (Colloq) guestimate/guesstimate
[4]	estimation , belief , opinion , judgement , thinking , feeling , sentiment , sense , (point of) view , viewpoint
[5]	estimation