I depends on your playstyle and what openings you may be open to experimenting with. Here are some solid options versus 1. d4
-1...d5 Symmetry yes, but this is clearly fine. Many avoid this because they don't want to face against the Queen's Gambit. If this is the case for you, then perhaps looking into a 1...Nf6 opening is the route you'll prefer. Otherwise, 1...d5 is okay. Simple, yes. Of course some lines can be complicated if you are into that playstyle. 1...d5 opening more complicated might be the sharp Slav Defense (1. d4 d5 2. c4 c6) or you might try the more tame (but also solid) Queen's Gambit Declined (1. d4 d5 2. c4 e6).
If you want to accept the Queen's Gambit, then you by all means can as long as you aren't too greedy with keeping the "extra" pawn. Black's best lines in the Queen's Gambit Accepted involve giving back the pawn at the right time to catch up in development. If you keep the pawn for dear life, then you'll likely either fall into a White trap, or give White an initiative or similar compensation for the pawn such as the center.
I comment all this about the Queen's Gambit because it is the "main" opening to consider when countering 1. d4 I think. Of course, White may play 1. d4 and not play the Queen's Gambit (Catalan, Trompowsky, English Opening by transposition etc.), but we are here to discuss primarily Black's options, not openings for White. 
-1...Nf6 has many good openings as well. I recommend looking into the exciting Nimzo-Indian Defense (1. d4 Nf6 2. c4 e6 3. Nc3 Bb4). I like sharp or dynamic play, but I realize this isn't for everyone.
King's Indian Defense (1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O) is a popular opening as well with plenty of theory, but Black has to be okay with pawn storms to play this opening. Black typically plays for ...f5 at some point and might even begin advancing the Kingside pawns in front of the King; dangerous? Yes, sometimes it is. It can be even trickier if White's pawn storm on the Kingside comes in too! Then both Kings are a bit more in the open than other options, but it is a solid enough opening to play up through grandmaster.
Dutch Defense (1. d4 f5) is an interesting option if you want to catch 1. d4 players less prepared since this opening is less common and perhaps your opponent doesn't know the main ideas but you do This is the recommendation from IM Levy Rozman (@GothamChess) for players 1800+ in rating. (For lower ratings I think they recommended the King's Indian Defense, but I don't recall for sure - many openings are good if you are willing to learn the key ideas and experiment a bit).
Grunfeld Defense is also really good if you like the endgame and sharp middlegames with a lot of theory. This is another advanced opening, but the hypermodern idea is to allow White to take the center (risky, but might pay off) and then play around striking the center. White will try to prove the center is a strong mass and try to hang on. Meanwhile, Black will try to claim the center is more of a target than an asset and Black will try to keep the initiative and play against the center with many thematic ways to try and undermine it. If Black is successful in getting the White center to collapse, then Black will often win. The Grunfeld Opening is: 1. d4 Nf6 2. c4 g6 3. Nc3 d5.
It is just a matter of seeing what middlegames you like and are comfortable with 
What are some openings I can use against d4 as an 1400+ rated rapid player... Note I am not trying to learn everything atm just a opening or 2 to solidly play against the Queen's pawn
I have been playing the englund gambit against d4 for a while... I was looking for some more solid options.