cocoon
繭 centers on the protective casing spun by silkworms: a cocoon. The meaning is concrete and specific, with no major abstract extensions.
繭 combines 糸 (thread) with a component that likely depicts a silkworm or cocoon shape. The exact historical development of the inner part is uncertain, but the character clearly relates to silk and cocoons.
The top 艹 suggests plant material, and the bottom has 糸 (thread) and 虫 (insect). Picture a silkworm inside a cocoon made of thread, hanging from a plant: 繭 is a cocoon.
For ケン, imagine a cocoon that looks like a tiny tent: tent -> ケン, and inside the tent a silkworm is spinning its cocoon.
cocoon
double cocoon
cocoon crop
braconid; member of the Braconidae (family of parasitic wasps)
waste cocoon (silk); bad cocoon; damaged cocoon
Japanese oak silkmoth (Antheraea yamamai)
Japanese oak silkmoth (Antheraea yamamai)
spring cocoon crop
dupion (double cocoon formed jointly by two or more silkworms); dupioni
raw cocoon
(silkworm) cocoon production
taking silkworm cocoons out of the cocoon holder
to spin a cocoon
price of a cocoon
New Year's decoration with cocoon-shaped cakes
silkworm cocoon
yellow cocoon