to need or demand something
require
to get and keep things of one type such as stamps or coins as a hobby
to collect
a collection or mass, especially of something that cannot be counted
amount
important or noticeable
significant
enough
adequate
to do something or deal with something successfully
to manage
the possibility of something bad happening
a risk
(especially of liquids, gases, or electricity) to move in one direction, especially continuously and easily
flows
a useful or valuable possession or quality of a country, organization, or person
resource
to provide things that people want or need
supply