輪虫 is read as わむし (wamushi) and means rotifer.
わむし
wamushi
りんちゅうるい
rotifers
わ
circle (e.g. of friends)
わごむ
rubber band
りんばん
rotation (e.g. of a duty)
わぎり
dividing into groups (e.g. by ability)
りんてんき
rotary press
りんけいどうぶつ
rotifer
りんこう
traveling with one's bicycle using public transportation
りんせい
verticillation
りんぎょう
bicycle industry
わまわし
hoop trundling or rolling
りんさく
rotation of crops