Fill in the blanks: More _____ means more iron?

Questions

One of a group of peoples inhabiting N Canada, Greenland, Alaska and E Siberia?

An articulated puppet, worked by strings?

Invertebrate with tufted gills living in burrows in muddy sand, often used as bait by fishermen?

The administrative capital of South Africa?

An alphabetical list of terms or words, relating to a specific subject or text?