As nouns the difference between terms and helvetian
is that terms is while helvetian is someone from the ancient country of helvetia.
As an adjective helvetian is
from the ancient country of helvetia.
terms
English
Noun
(head)
Statistics
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helvetian
English
Adjective
(-)
From the ancient country of Helvetia
(poetic) Swiss, from Switzerland
Noun
(
en noun)
Someone from the ancient country of Helvetia
Swiss, someone from Switzerland