Old-age insurance and Social security

Old-age insurance noun - Insurance paid to the elderly.

Social security and old-age insurance are semantically related. In some cases you can use "Social security" instead a noun phrase "Old-age insurance".

Social security noun - Social welfare program in the U.S.; includes old-age and survivors insurance and some unemployment insurance and old-age assistance.

Old-age insurance and social security are semantically related. Sometimes you can replace phrase "Old-age insurance" with "Social security", this phrases are similar.