Collective noun of birds grass aircraft parents tools satellites?

Here are some collective nouns for the words you provided, keeping in mind that some of them are less common than others:

* Birds: A flock of birds, a murder of crows, a parliament of owls, a gaggle of geese

* Grass: A patch of grass, a lawn of grass, a field of grass (these are more descriptive than collective)

* Aircraft: A fleet of aircraft, a squadron of aircraft, a formation of aircraft

* Parents: A group of parents, a body of parents, a committee of parents (these are more formal)

* Tools: A set of tools, a kit of tools, an arsenal of tools

* Satellites: A constellation of satellites, a network of satellites, a cluster of satellites

It's important to note that there isn't always one perfect collective noun for every word, and some are more specific to certain types of birds, for example.