Janus
acosmism
allotheism
ambiguity
ambivalence
anthropolatry
anthropomorphism
anthropotheism
autotheism
biformity
bifurcation
conjugation
cosmotheism
deism
dichotomy
ditheism
doubleness
doublethink
doubling
duality
duplexity
duplication
duplicity
dyotheism
equivocality
halving
henotheism
hylotheism
irony
monolatry
monotheism
multitheism
myriotheism
pairing
pantheism
physicomorphism
physitheism
pluralism
polarity
polytheism
psychotheism
tetratheism
theism
theopantism
theriotheism
tritheism
twinning
two-facedness
twoness
zootheism
doctrine
ism
philosophical system
philosophy
school of thought
dual
agnosticism
alchemy
antithesis
demonology
determinism
dilemma
fatalism
idealism
materialism
metaphysics
monasticism
mysticism
naturalism
orthodoxy
paradox
pessimism
realism
symbolism
teleology
individualism
intellectualism