Why does having many nouns not automatically establish tamthīl?

Divisions of Simile: Single/Composite, Enfolded/Separated, Taswiya/Jamʿ, Tamthīl and Explicitness

• Every simile has one word
• The extraction of the common pattern must be assessed
• Tamthīl never uses a marker
• Tamthīl is only an adjective type