These characters all contain 各

but the pronunciations are not related to ge or ke.

路 is lù and means 'road'.

络 is luò and means 'net'.

落 is luò and means 'fall'.

骆 Luò is the first character in 骆驼 luòtuo 'camel'.

The element 马 in both of these characters means 'horse'.

Common words including these characters:

走路 zǒulù 'to walk'
联络 liánluò 'get in touch with'
降落 jiàngluò 'to land (of a plane)'