Synonyms for litter

Most common

1. Rubbish — waste or debris, originally any mess but now particularly trash left or thrown on the ground

2. Hay bed — straw, grass, and similar loose material used as bedding for people or animals. A bed, especially a pile of…

3. Grass — synonym of straw, grass, etc. more generally, particularly in plaster, thatch, and mulch

Other

n. 1
Straw, grass, and similar loose material used as bedding for people or animals. A bed, especially a pile of straw (sometimes also with blankets) used as a bed.
Near-synonyms: pallet, straw bed, hay bed (all broadly synonymous)
n. 2
Synonym of straw, grass, etc. more generally, particularly in plaster, thatch, and mulch.
n. 3
Waste or debris, originally any mess but now particularly trash left or thrown on the ground.
Near-synonyms: garbage; see also Thesaurus:trash
v. 1
To drop or throw trash without properly disposing of it (as discarding in public areas rather than trash receptacles).
By tossing the bottle out the window, he was littering.

Word family: litterer
Phrases: litter box cat litter litter lout litter tray hammock litter horse litter kitty litter rough-backed litter snake
Is a kind of: conveyance vehicle device

Litter, Brood or Groups?

The individuals in a brood or litter are related to each other; those in the other groups may not be.

J. C. Fernald, English Synonyms and Antonyms (1914)

Use in printed books, per decade from 1850 to 2019.

4 letters: mess¹, junk¹, muss, pelf
5 letters: waste¹, trash¹, grass¹, straw¹, scrap¹, flock¹, sedan², brood¹, offal
6 letters: refuse², debris², riddle², pallet²
7 letters: garbage², rubbish², bedding², scatter², clutter², derange²
8 letters: disorder³
9 letters: stretcher², palanquin

The small number after each word is its number of syllables (sedan² = 2 syllables).