species, kind, class, variety, seed
種 centers on the idea of a fundamental category or origin point: a species, kind, or class, and by extension the seed from which something grows.
種 combines 禾 (grain/rice plant) with 重, which likely contributes the sound and the idea of weight or importance, suggesting the seed as the weighty, essential part of the plant.
The left side 禾 is a grain plant, and the right side 重 looks heavy. Picture the heavy, important seeds of the grain that carry the species forward.
For シュ, imagine a shoe filled with seeds: shoe -> シュ, and each seed represents a different kind or species.
seed (e.g. of a plant); pip; kernel; stone (e.g. of a peach)
variety; kind; type; category
every kind; all sorts
model (of machine, device)
race (of people)
a kind; a sort; a variety; a species
race; tribe; ethnic group
type (of goods); sort
car model
inoculation; vaccination
seed; pit
classification; assortment
item; event
type of industry
type of occupation; occupational category
same kind; same sort; same species; same race; homogeneity
various; a variety of; all kinds of; many; diverse
three kinds; three varieties
live coals (for firelighting)
A-grade; first-class
rapeseed; coleseed
vaccination; inoculation; immunization; immunisation
smallpox vaccination; inoculation against smallpox
rich in variety; diverse; wide-ranging; multifarious