1. necessitate, ask, postulate, need, require, take, involve, call for, demand
usage: require as useful, just, or proper; "It takes nerve to do what she did"; "success usually requires hard work"; "This job asks a lot of patience and skill"; "This position demands a lot of personal sacrifice"; "This dinner calls for a spectacular dessert"; "This intervention does not postulate a patient's consent"
2. want, need, require, be
usage: have need of; "This piano wants the attention of a competent tuner"
usage: have or feel a need for; "always needing friends and money"