Answer:
Public, Eclipse, Pardon
Explanation:
1. The 21 consonant letters in the English alphabet are B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Z, and sometimes Y (not a vowel)
2. Public has b and l in between two vowels
3. Eclipse has c and l in between two vowels
4. Pardon has r and d between two vowels