noun:

• automobile inspection certificate ➜ 車検証

noun:

• motorcycle (with a displacement of 50cc or more); motorbike

noun / ~する noun:

• concealing one's talents, position, status, intentions, etc. - four character idiom

noun:

• private airplane; private jet ➜ ビジネスジェット

noun:

• automatic controller; servo - IT term

expression / noun:

• one's own strength or effort; (by) oneself

noun:

• self-cleansing power; being capable of purifying oneself - four character idiom

noun:

• free competition

noun:

• one's religious sect

noun:

• ghost bound to a specific physical location (usu. where death occurred) ➜ 浮遊霊

expression / noun / adjectival noun:

• blindness; the blind

noun:

• self-consciousness

noun:

• abandoning artifice and just being oneself; doing nothing and taking things as they come - four character idiom
• unconditioned nature; unconditioned spontaneity - Buddhism term

noun:

• natural alimentation

noun:

• self-responsibility; on one's own responsibility; at one's own risk

noun:

• Liberal League (Japanese political party, 1994-2005)

expression / noun:

• the Four Freedoms (as defined by Franklin D. Roosevelt: freedom of speech, freedom of worship, freedom from want, freedom from fear)

noun:

• used car

noun:

• autopurificatory activity (in the natural world) - four character idiom

noun:

• free association (in psychology)

noun:

• self-censorship

noun:

• boasting of one's hometown

noun / ~する noun:

• autopost - IT term

noun:

• private power generation
• masturbation - colloquialism

noun:

• physics (study of natural science in ancient Greek philosophy) ➜ 自然哲学