nest

noun
A structure built by a bird as a place to incubate eggs and rear young.
A place used by another mammal, fish, amphibian or insect, for depositing eggs and hatching young.
A snug, comfortable, or cosy residence or job situation.
A retreat, or place of habitual resort.
A hideout for bad people to frequent or haunt; a den.

That nightclub is a nest of strange people!
A home that a child or young adult shares with a parent or guardian.

I am aspiring to leave the nest.
A fixed number of cards in some bidding games awarded to the highest bidder allowing him to exchange any or all with cards in his hand.

I was forced to change trumps when I found the ace, jack, and nine of diamonds in the nest.
A fortified position for a weapon.
A structure consisting of nested structures, such as nested loops or nested subroutine calls.
A circular bed of pasta, rice, etc. to be topped or filled with other foods.
An aggregated mass of any ore or mineral, in an isolated state, within a rock.
A collection of boxes, cases, or the like, of graduated size, each put within the one next larger.
A compact group of pulleys, gears, springs, etc., working together or collectively.

verb
(of animals) To build or settle into a nest.
To settle into a home.

We loved the new house and were nesting there in two days!
To successively neatly fit inside another.

I bought a set of nesting mixing bowls for my mother.
To place in, or as if in, a nest.
To place one thing neatly inside another, and both inside yet another (and so on).

There would be much more room in the attic if you had nested all the empty boxes.
To hunt for birds' nests or their contents (usually "go nesting").