おやゆび親指oyayubi
1.
The thickest digit located on the hand or foot, positioned at the outer end among the five fingers, and capable of opposing the other fingers for enhanced grasping ability.
2.
A term historically used to refer to the head of a household, master, or foreman, derived from its association with the prominent position and strength of the thumb among the fingers.
Example:
その手袋は親指に穴があいている。
おやゆび親指oyayubiのnoつめ爪tsume
1.
A small, flat hard part located at the tip of the thumb, typically used for gripping or pinching objects.
2.
The outer covering of the thumb that protects the sensitive nail bed underneath, often adorned or maintained for aesthetic purposes.
3.
The keratinous structure at the end of the thumb, which plays a role in tactile sensation and manipulation of tools.