As nouns the difference between antra and yantra
is that antra is plural of lang=en while yantra is a geometrical diagram used as a meditation aid in tantric worship.
antra
English
Noun
(head)
----
yantra
English
Noun
(
en noun)
A geometrical diagram used as a meditation aid in tantric worship.
(religion) Any object used as a meditation aid in tantric worship.