• metapsichism,
• metapshychism,
• metapyschism,
• metapsychim,
• metapsychisn,
• metapsychsm,
• metaspychism,
• metapsyhcism

• metallurgy,
• metamaterial,
• metastasis,
• metaphysics,
• metamorphosis,
• metacarpal,
• metacognition,
• metachromatic,
• metabolism,
• metaphor.

The adjective form of "metapsychism" is "metapsychic".

The plural form of the word "metapsychism" is "metapsychisms".

The singular form of the word "metapsychism" is "metapsychism". The word does not change when referring to a single instance or concept.