Fetching details from the dictionary...

one's father; one's old man; dad; pops
middle-aged (or older) man; old man; geezer
one's boss
proprietor (of a restaurant, store, etc.); landlord
grizzly bear
おやじは定年後も畑仕事を楽しんでいる。
My old man enjoys working in the field even after retirement.
おやじの作る味噌汁が一番うまいと思っている。
I think the miso soup my dad makes is the best.
おやじに似てきたと友人に言われて複雑な気分だ。
A friend told me I am starting to look like my dad, and I had mixed feelings.