lad's love vs old man

lad's love and old man both are nouns.

Word	Noun	Adjective	Verb	Adverb
lad's love	Yes	No	No	No
old man	Yes	No	No	No

As nouns, lad's love and old man are synonyms defined as:

lad's love and old man: aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe

Other synonyms of lad's love include absinthe, Artemisia absinthium, common wormwood.

lad's love (noun)	old man (noun)
aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe	an informal term for your father
	a man who is very old
	a familiar term of address for a man
	(slang) boss
	aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe