Modifiers matching visa:

• permanent,
• resident,
• migrant,
• temporary,
• valid,

Simple categories matching migrant:

• shorebird,
• group,
• bird,
• insectivore,
• labourer,
• worker,
• organization,
• passerine,
• finch,
• songbird,
• sandpiper,
• visa,
• warbler,
• waterbird,
• language,
• population,
• fish,
• thrush,
• sparrow,