This is the 6556th most frequent Chinese word.
无家可归
Homeless.
Here, '无家可归' is used as an adjective describing 'people' ('许多...人'). It emphasizes the state of lacking a home.
许多无家可归的人住在临时的庇护所中。
Many homeless individuals live in temporary shelters.
In this sentence, '无家可归' acts as an adjective modifying 'people' ('那些...的人'), asking about aid for homeless individuals.
是否有政府机构正在帮助那些无家可归的人？
Are there government agencies assisting those who are homeless?
Here, '无家可归' is used as a noun, referring to the concept or state of homelessness as a broader issue.