Nouns

(n)modesty, reserveformality and propriety of manner
(n)reserve, backlog, stockpilesomething kept back or saved for future use or a special purpose
(n)substitute, reserve, second-stringeran athlete who plays only when a starter on the team is replaced
(n)reserve(medicine) potential capacity to respond in order to maintain vital functions
(n)reservation, reservea district that is reserved for particular purpose
(n)military reserve, reservearmed forces that are not on active duty but can be called in an emergency
(n)reserve, reticence, taciturnitythe trait of being uncommunicative; not volunteering anything more than necessary

Verbs

(v)reservehold back or set aside, especially for future use or contingency“they reserved their applause in anticipation”
(v)allow, appropriate, earmark, set aside, reservegive or assign a resource to a particular person or cause“I will earmark this money for your research”, “She sets aside time for meditation every day”
(v)reserveobtain or arrange (for oneself) in advance“We managed to reserve a table at Maxim's”
(v)reserve, hold, bookarrange for and reserve (something for someone else) in advance“reserve me a seat on a flight”, “The agent booked tickets to the show for the whole family”, “please hold a table at Maxim's”