父親|ちちおやchichioya[0]heiban (flat)

1. nounfather
   その少年しょうねんは父親ちちおやに似にている。↗

   The boy takes after his father.

• Synonym父ちちNeutralUsed when you mention your own father to people outside the family; slightly more formal. 「父親」 is the objective term and works for your own or anyone's father.
• Synonymお父さんおとうさんNeutralThe everyday standby: use it to address your father directly or to refer to someone else's father. 「父親」 is never used as a direct address.
• SynonymおやじWrittenRead 「しんぷ」, this is a rare written-style word for father; the same written form read 「おやじ」 is the colloquial men's term.
• Synonym父さんとうさんCasualA casual form of 「お父さん」, used mostly within the family to address one's father directly.
• Synonym男親おとこおやNeutralStresses that the parent is male, often set against 「女親」; much less common than 「父親」.
• SynonymファーザーNeutralA loanword, rare in everyday speech; mostly seen in 「ゴッドファーザー」 or as the title for a Catholic priest.
• Relatedお父様おとうさまFormalA very polite honorific for another person's father, or for one's own father in strict, traditional households.
• Related親父しんぷWrittenRead 「しんぷ」, this is a rare written-style word for father; the same written form read 「おやじ」 is the colloquial men's term.
• Related父上ちちうえFormalAn archaic honorific for one's own father, now found mainly in period dramas and letters.
• Related父君ふくんWrittenAn elegant, old-fashioned honorific for one's father, seen mostly in classical literature.
• Related父御ちちごWrittenAn archaic honorific for another person's father; essentially no longer used today.
• RelatedおとっつぁんCasualAn affectionate Edo-period commoner's way of calling one's father; now mostly heard in period dramas.
• Antonym母親ははおやNeutralThe antonym: a mother, the female counterpart to 「父親」.

Use 「父親」 for neutral, objective reference to a father — your own or anyone's, as in 「私の父親」. When mentioning your own father to outsiders, 「父」 is common; to address your father directly or refer to another person's father, say 「お父さん」. For extra politeness use 「お父様」; men speaking casually may say 「親父（おやじ）」. The other terms are rare, archaic or stylistic.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. ちち。おとこおや。男性だんせいである親おや。