How to Say "cocoon" in Spanish
The Spanish word for “cocoon” is “capullo” — B2 level.
English → SpanishB2
nounB2
silkworm or insect casing

Examples
El gusano de seda está dentro de su capullo.
The silkworm is inside its cocoon.
Hacen falta muchos capullos para fabricar seda.
Many cocoons are needed to manufacture silk.
La oruga sale del capullo convertida en mariposa.
The caterpillar emerges from the cocoon turned into a butterfly.
Scientific Nouns
In this context, 'capullo' functions as a standard technical noun. It doesn't change form whether referring to a moth or a butterfly.
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