lord, lords, master, masters, sir, sirs

Definition:

The term "lord" refers to someone who has ownership or authority over other people.

This word is sometimes translated as "master" when addressing Jesus or when referring to someone who owns slaves.
Some English versions translate this as "sir" in contexts where someone is politely addressing someone of higher status.

This term can be translated with the equivalent of "master" when it refers to a person who owns slaves. It can also be used by a servant to address the person he works for.
When it refers to Jesus, if the context shows that the speaker sees him as a religious teacher, it can be translated with a respectful address for a religious teacher, such as "master."
If the person addressing Jesus does not know him, "lord" could be translated with a respectful form of address such as "sir." This translation would also be used for other contexts in which a polite form of address to a man is called for.
When referring to God the Father or to Jesus, this term is considered a title, written as "Lord" (capitalized) in English.

25:05 But Jesus replied to Satan by quoting from the Scriptures. He said, "In God's word, he commands his people, 'Do not test the Lord your God.'"
25:07 Jesus replied, "Get away from me, Satan! In God's word he commands his people, 'Worship only the Lord your God and only serve him.'"
26:03 This is the year of the Lord's favor.
27:02 The law expert replied that God's law says, "Love the Lord your God with all your heart, soul, strength, and mind."
31:05 Then Peter said to Jesus, "Master, if it is you, command me to come to you on the water"
43:09"But know for certain that God has caused Jesus to become both Lord and Messiah!"
47:03 By means of this demon she predicted the future for people, she made a lot of money for her masters as a fortuneteller.
47:11 Paul answered, "Believe in Jesus, the Master, and you and your family will be saved."