fir
樅 centers on a specific type of tree: the fir, an evergreen conifer.
樅 combines 木 (tree) with 從, which likely contributes the sound. The character was created to name the fir tree specifically.
The tree radical 木 on the left tells you this is a type of tree. The right side 從 looks like two people following a path, but here just imagine a tall, straight fir tree standing among others.
For ショウ, picture a fir tree growing tall and straight, like a showpiece in a forest: show -> ショウ.
Japanese fir (Abies firma); momi fir
Pacific silver fir (Abies amabilis)
balsam fir (Abies balsamea)
European silver fir (Abies alba)
Catathelasma ventricosum (Peck) Sing. (species of mushroom)
white fir (Abies concolor)
Nikko fir (Abies homolepis)
Lactarius laeticolorus (edible species of lactarius mushroom)
tiger-tail spruce (Picea polita)