種 (Kanji for seed　/ type or kind)

Onyomi

SHU	See His Underpants - what kind are they?

This kind of wheat seed is really heavy.

たね	seed ★★★☆☆

種類(しゅるい)

variety or type of thing ★★★★☆
種 (seed　/ type or kind) + 類 (category,type) = 種類 (variety or type of thing)

人種(じんしゅ)

race of people ★★★☆☆
人 (person) + 種 (seed　/ type or kind) = 人種 (race of people)

race of people. (BOOBOO - 人種 is not ethnic group like Albanians, it means race like honkeys.)

You send a letter in the mail to TOWN,

but the SWORD cuts the excessive stuff down.

Types of WHEAT seeds come in different lengths,
but to move and plant them takes a lot of STRENGTH.