mere

nouns

a small pond of standing water
domain region
a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
is a type of (narrower)
a small lake
"the pond was too small for sailing"

adjectives

being nothing more than specified
"a mere child"
is similar to
clearly and explicitly stated
"meals are at specified times"
apart from anything else; without additions or modifications
"only the bare facts"; "shocked by the mere idea"; "the simple passage of time was enough"; "the simple truth"