| hearken(verb, note, follow, observe, attend) |
| heed(verb, note, follow, observe, attend) |
| heedful(adjective, alert, careful, cautious, attentive) |
| hooked(adjective, ready, alert, careful, cautious) |
| humor(verb, advance, feed, nurture, tend) |
| hunt |
| hunt for |
| hunt up |
| immunize(verb, advance, feed, nurture, tend) |
| indulge(verb, advance, feed, nurture, tend) |
| inoculate(verb, advance, feed, nurture, tend) |
| irradiate(verb, advance, feed, nurture, tend) |
| jell(verb, move, close, discharge, settle) |
| keen(adjective, alert, careful, cautious, attentive) |
| keep alive(verb, expression, advance, feed, nurture) |
| keep an eye on(verb, expression, idiom, phrasal verb, advance) |
| keep tabs on(verb, expression, idiom, phrasal verb, advance) |
| keep watch over(expression, idiom) |
| lend an ear(verb, expression, idiom, note, follow) |
| lick into shape(verb, expression, idiom, form, order) |