Countable Nouns That Start with A and End with US

Explore 100 verified English countable nouns starting with A and ending with US, including Apparatus, Asparagus, Alumnus, Antivirus, Anus, Autofocus and Abacus. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with AB3 words
abacus
abortus
abaciscus
Starts with AC9 words
acidophilus
acanthus
actus
acinus
aculeus
accessorius
acarus
acervulus
actinobacillus
Starts with AD7 words
adenovirus
adolphus
aditus
adoretus
adradius
adscriptitius
adenoncus
Starts with AE10 words
aesculus
aerobus
aegagrus
aedeagus
aegyptopithecus
aeschynanthus
aegypius
aetobatus
aetosaurus
aechmophorus
Starts with AF
2 words
afflatus
affectus
Starts with AG
1 words
agapanthus
Starts with AI
2 words
airbus
ailanthus
Starts with AL7 words
alumnus
alveolus
altocumulus
allosaurus
altostratus
albertosaurus
allaeanthus
Starts with AM5 words
amicus
amplexus
amphioxus
amianthus
amaracus
Starts with AN24 words
antivirus
anus
angelus
annulus
andronicus
ankylosaurus
annus
anestrus
angulus
ankus
anthropophagus
anencephalus
antechinus
antibacchius
antitragus
anacyclus
antoninianus
andricus
anigozanthus
anoectochilus
antibarbarus
anisotremus
anomalurus
antenatus
Starts with AP4 words
apparatus
apatosaurus
apiculus
apostrophus
Starts with AR9 words
argus
arquebus
arbovirus
arbutus
arcus
arenavirus
archeus
artocarpus
argulus
Starts with AS4 words
asparagus
aspergillus
astragalus
ascus
Starts with AU4 words
autofocus
autobus
australopithecus
aureus

•Browse Countable Nouns by Letter (A to Z)

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