lady's tobacco vs ladies' tobacco

lady's tobacco and ladies' tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
lady's tobacco	Yes	No	No	No
ladies' tobacco	Yes	No	No	No

As nouns, lady's tobacco and ladies' tobacco are synonyms defined as:

lady's tobacco and ladies' tobacco: North American perennial propagated by means of runners

Other synonyms of lady's tobacco include Antennaria plantaginifolia.

lady's tobacco (noun)	ladies' tobacco (noun)
North American perennial propagated by means of runners	North American perennial propagated by means of runners