If some people who can't afford food are experiencing "food insecurity," why don't they call the homeless people,

[intheflow]

1. People DO refer to homeless people as "housing insecure," and same with healthcare insecurity.

Housing insecurity is the lack of security in an individual shelter that is the result of high housing costs relative to income and is associated with poor housing quality, unstable neighborhoods, overcrowding, and homelessness.
https://en.wikipedia.org/wiki/Housing_insecurity_in_the_United_States

We define health care insecurity as feeling uncertain, anxious, and vulnerable about the ability to obtain or sustain adequate health care services. This concept goes beyond traditional measures of health care access by assessing an individual’s subjective sense of vulnerability, lack of control, and worry about getting the health care they need when they need it. A measure of health care insecurity is necessary to supplement current measures of access and patient experience of health care. Such a measure can focus energy on reducing this under-recognized source of suffering among the underserved, and can serve as an outcome measure for health care improvement efforts.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4492521/
(article from 2014, when the HHS was sane.)

"Food insecurity" is not a bullshit euphemism. It describes people who worry about if they'll be able to eat, and includes a lot of people on SNAP even without the current cruelty expressly denying SNAP recipients their benefits.