Are there any one word synonyms and antonyms for these words?

I need to complete my year 7 spelling home work and we have several activities to do. The last one that I have to do is to find synonyms and antonyms for these words!! PLEASE HELP I AM DESPERATE!!!



WORDS:



terrain

hydrophobia

asteriod

aerospace

subterranean

extraterrestrial

astronomical

aerobics

dehydrate

hydrant

aerobatics

astronomy



I've looked EVERYWHERE!!! Thank you for your answers!!Are there any one word synonyms and antonyms for these words?
Synonyms:



terrain: landscape

hydrophobia: aquaphobia

asteroid: meteor?

aerospace: atmosphere

subterranean: underground

extraterrestrial: alien

astronomical: relating to starwatching, space science

aerobics: exercise

dehydrate: desiccate

hydrant: humidifier?

aerobatics: aerial stunts

astronomy: starwatching, space science



Antonyms:



terrain: waterbody?

hydrophobia: hydrophilia

asteroid: planet?

aerospace: biosphere?

subterranean: superterranean

extraterrestrial: intraterrestrial

astronomical: bathymetric (study of depths)? geographical (study of world)? oceanographic?

aerobics: anaerobics

dehydrate: hydrate

hydrant: dehydrant

aerobatics: acrobatics?

astronomy: bathymetry (study of depths)? geography (study of world)? oceanography?Are there any one word synonyms and antonyms for these words?
terrain - (S) - topography

hydrophobia -

asteriod

aerospace -

subterranean - (A)-superterranean

extraterrestrial - (A)-intraterrestial

astronomical - (A)-abysmal

aerobics

dehydrate -(A) Hydrate

hydrant - (A) Dehydrant

aerobatics

astronomy