Alexander vs Alexanders

Alexander and Alexanders both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alexander	Yes	No	No	No
Alexanders	Yes	No	No	No

As nouns, Alexander and Alexanders are synonyms defined as:

Alexander and Alexanders: European herb somewhat resembling celery widely naturalized in Britain coastal regions and often cultivated as a potherb

Other synonyms of Alexander include black lovage, horse parsley, Smyrnium olusatrum.

Alexander (noun)	Alexanders (noun)
king of Macedon; conqueror of Greece and Egypt and Persia; founder of Alexandria (356-323 BC)	European herb somewhat resembling celery widely naturalized in Britain coastal regions and often cultivated as a potherb
European herb somewhat resembling celery widely naturalized in Britain coastal regions and often cultivated as a potherb