Here's a little list for all the writers out there with the most common german petnames/terms of endearment for partners but also children and occasionally friends
• literal meaning is "treasure"
• the english equivalent would be "honey" or "babe"/"baby"
• is used between partners and (grand)parents/children
• there's also "Schätzchen" but that's either used for small children or more commomly in a belittling way
• there is no literal translation to english but it comes from the word "Liebe" which means "love"
• the english equivalent would be "darling"
• it can be used between partners as well as parents/children but partners is much more common
• also has no literal translation to english but comes from the word "Liebe" just like "Liebling", it's basically another form
• the english equivalent would be "love" but keep in mind that the german noun "Liebe" can NOT be used as a petname like that
○ what you could do is add "meine/mein" (means my) but that is often used in a belittling way
● "Thank you, Liebes" is right, "Thank you, Liebe" is wrong
-> you could do "Thank you, meine Liebe (female)/mein Lieber (male)" but that wouldn't be used between partners, more so from old people to young
● "Not in that tone, mein Lieber" is a sentence you hear from parents a lot though, so not in endearment but more as a 'warning'
• there is no english translation
• I can't think of a direct equivalent but "hun" probably comes close
• it's mostly used by elder people for small children, or their grandchildren (then age really doesn't matter, my grandma still calls me that)
Süße (female)/Süßer (male)
• literal translation would be a form of "sweet"
• therefore the closest english equivalent would be "sweetie"
• the male version "Süßer" is rarely used
○ some women and (gay) men use it in a flirty way but other than that I don't think I've ever heard it
• the female version "Süße" is much more commonly used between two close female friends or from a woman to a young girl
• "Oh Süße, what's going on?"
• it's mostly used by parents for their young daughters although my mom still occasionally called me that when I was older and something was obviously going on (like me being sad because of something)
• is also an often petname between friends, just like "Süße"
• "Oh Maus, what's going on?"