house (n.)youdaoicibaDictYouDict
Old English hus "dwelling, shelter, house," from Proto-Germanic *husan (cognates: Old Norse, Old Frisian hus, Dutch huis, German Haus), of unknown origin, perhaps connected to the root of hide (v.) [OED]. In Gothic only in gudhus "temple," literally "god-house;" the usual word for "house" in Gothic being razn.

Meaning "family, including ancestors and descendants, especially if noble" is from c. 1000. The legislative sense (1540s) is transferred from the building in which the body meets. Meaning "audience in a theater" is from 1660s (transferred from the theater itself, playhouse); as a dance club DJ music style, probably from the Warehouse, a Chicago nightclub where the style is said to have originated. Zodiac sense is first attested late 14c. To play house is from 1871; as suggestive of "have sex, shack up," 1968. House arrest first attested 1936. On the house "free" is from 1889.
And the Prophet Isaiah the sonne of Amos came to him, and saide vnto him, Thus saith the Lord, Set thine house in order: for thou shalt die, and not liue. [2 Kings xx:1, version of 1611]
shack (n.)youdaoicibaDictYouDict
1878, American English and Canadian English, of unknown origin, perhaps from Mexican Spanish jacal, from Nahuatl (Aztecan) xacalli "wooden hut." Or perhaps a back-formation from dialectal English shackly "shaky, rickety" (1843), a derivative of shack, a dialectal variant of shake (v.). Another theory derives shack from ramshackle.

Slang meaning "house" attested by 1910. In early radio enthusiast slang, it was the word for a room or office set aside for wireless use, 1919, perhaps from earlier U.S. Navy use (1917). As a verb, 1891 in the U.S. West in reference to men who "hole up" for the winter; from 1927 as "to put up for the night;" phrase shack up "cohabit" first recorded 1935 (in Zora Neale Hurston).