roebuck, moschus chinloo
麞 refers to a specific kind of deer: the roebuck or a related musk deer (moschus chinloo). Its meaning is narrow and zoological, with no broader conceptual center.
麞 combines 鹿 (deer) with 章, which likely provides the sound. The character was created to name a specific deer species.
A deer (鹿) with a badge or chapter (章) on its side: picture a roebuck with a distinctive mark that identifies it.
For ショウ, imagine a show (ショウ) of deer, with the roebuck as the star: show -> ショウ.