smallholding vs landed estate

smallholding and landed estate both are nouns.

Word	Noun	Adjective	Verb	Adverb
smallholding	Yes	No	No	No
landed estate	Yes	No	No	No

As nouns, landed estate is a hypernym of smallholding; that is, landed estate is a word with a broader meaning than smallholding:

smallholding: a piece of land under 50 acres that is sold or let to someone for cultivation
landed estate: extensive landed property (especially in the country) retained by the owner for his own use

Other hypernyms of smallholding include acres, demesne, estate, land.

smallholding (noun)	landed estate (noun)
a piece of land under 50 acres that is sold or let to someone for cultivation	extensive landed property (especially in the country) retained by the owner for his own use