impractical vs Laputan

impractical and Laputan both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impractical	No	Yes	No	No
Laputan	No	Yes	No	No

As adjectives, impractical and Laputan are synonyms defined as:

Other synonyms of impractical include airy, visionary, windy.

impractical (adjective)	Laputan (adjective)
not practical; not workable or not given to practical matters	relating to or characteristic of the imaginary country of Laputa or its people
not practical or realizable; speculative	not practical or realizable; speculative